[Physics-talks] PASS talk on Galaxy Morphology

[Pooyan Goodarzi]

Reminder, happening in ~1 hour.

On Thu, Sep 25, 2025 at 08:50 Pooyan Goodarzi <pooyan.goodarzi at email.ucr.edu>
wrote:

> Hi everyone,
>
>
> We will have the first PASS talk of this academic year on *Monday,
> September 29*. Jose will be talking about the Morphological diversity of
> Galaxies in the Local Universe. Please join us at noon (*from 12:00 to
> 1:00 pm*) in the *Nebula Room* (PHYS 3027).
>
>
>
> *Dr. Jose Benavides, PostDoc Researcher *Monday, 12:00 pm, Nebula Room
> (PHYS 3027)
>
> *Exploring the Morphological Diversity of Galaxies in the Local Universe*
>
>
> In the  Local Universe, galaxies exhibit a remarkable morphological
> diversity, ranging from massive spirals and ellipticals to irregular and
> dispersion-dominated low-mass systems. Understanding the origin of this
> diversity is of vital importance for testing and refining our models of
> galaxy formation and evolution.
>
> In the first part, I will focus on the physical conditions that govern
> disc formation in low-mass galaxies (M_star < 10^10 M_sun). Using data from
> the FIREbox and FIRE zoom-in cosmological simulations, we explore how
> stellar feedback, gas dynamics, and halo spin contribute to the emergence
> of rotationally supported structures. Our results show that discs can form
> under specific conditions—such as the presence of cold,
> high-angular-momentum gas or interactions with satellites—and we identify a
> morphological transition from spheroidal to disky systems at M_star ~ 10^9
> -10^10 M_sun.
>
> In the second part, I will analyze the shapes of galaxies through the
> distribution of projected axis ratios (q=b/a) across both observational
> surveys (GAMA, DESI, ALFALFA, and Nearby Galaxy surveys) and cosmological
> simulations (TNG50, FIREbox, and ROMULUS25). This comparison reveals a
> systematic under-prediction of thin, disky low-mass galaxies in
> simulations, suggesting limitations in current models of baryonic physics,
> feedback, and morphological evolution.
>
>
>
> If you’re interested in sharing your work as a speaker, please feel free
> to add your name to this spreadsheet [Google Sheet
> <https://docs.google.com/spreadsheets/d/1N3ncf43jdB6aHYHhyWmyHMycxDg4_phHZXLkQvviO0o/edit?usp=sharing>].
> Recordings of all the previous talks are available on our website:
> https://ucrpass.arxiv.social
>
>
> Best,
> Pooyan
> Physics and Astronomy Student Seminar (PASS)
> https://ucrpass.arxiv.social
>
>
>
>
>
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